A fast and versatile quantum key distribution system with hardware key distillation and wavelength multiplexing
Abstract
We present a compactly integrated, 625 MHz clocked coherent one-way quantum key distribution system which continuously distributes secret keys over an optical fibre link. To support high secret key rates, we implemented a fast hardware key distillation engine which allows for key distillation rates up to 4 Mbps in real time. The system employs wavelength multiplexing in order to run over only a single optical fibre. Using fast gated InGaAs single photon detectors, we reliably distribute secret keys with a rate above 21 kbps over 25 km of optical fibre. We optimized the system considering a security analysis that respects finite-key-size effects, authentication costs and system errors for a security parameter of ɛQKD = 4 × 10-9.
- Publication:
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New Journal of Physics
- Pub Date:
- January 2014
- DOI:
- 10.1088/1367-2630/16/1/013047
- arXiv:
- arXiv:1309.2583
- Bibcode:
- 2014NJPh...16a3047W
- Keywords:
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- Quantum Physics
- E-Print:
- New J. Phys., 16(1):013047, 2014